Why Edge AI Needs Lightweight Semantic Caches — and What Makes Them Hard to Build
Originally published on Medium.com on November 27, 2025.
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Today edge computing is reshaping the way AI systems are deployed. Instead of sending every request to centralized cloud infrastructure, more computation is happening on devices closer to end-users. These “edge environments” include IoT gateways, on-premise servers, mobile devices, micro-VMs, serverless functions, and browser-based applications. The appeal is clear: moving computation closer to where data is generated reduces latency, minimizes bandwidth requirements and allows organizations to satisfy strict data-privacy rules.
At the same time, WebAssembly (WASM) has emerged as a portable, sandboxed runtime for executing code in highly constrained or security-sensitive environments. Originally designed for browsers, WASM now runs in cloud edge workers, serverless platforms, and isolated environments where traditional binaries cannot be executed. These runtimes often restrict access to system calls such as networking, threading, or the local filesystem. They operate under strict memory limits, sometimes as low as tens of megabytes, and they prioritize deterministic, predictable execution.
Altogether, while offering obvious advantages, running AI components at the edge introduces its own challenges, especially when applications rely on semantic search, embeddings, or large language models (LLM).